2. if a circle has the diameter of 8, what is the circumference?

Since diameter is 8 the circumference is 8 pi

3.14 is the circumference and the diameter is 8 ,diameter is half of a radius so you have to do 3.14 times 16 and that's you circumference
50.24

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.